*Summary of dataset contents, contextualized in experimental procedures. *

• A path-integrated methane detector was set 2 m above ground level.
• A laser screen was positioned 15 to 20 m opposite of the detector.
• Methane measurements were transmitted every 2 seconds during measurements (varied for some data sets)
• The downwind distance from the leak center was either 5 m or 10 m depending on the controlled leak rate
• A total of 11 experiments were conducted.

Data and file structure

• The files are .csv meaning it can be opened with Microsoft excel or converted to .txt to re-use it
• The data sets contain 2 columns; 1st column is the time column, and the 2nd column is the methane mixing ratios column
• The 1st column is the time column in Mountain Time (one can always convert to any time zone)
• The 2nd column is in parts per million meters (ppm-m)
• The data can be used to re-produce a gas plume above-ground at various distances from the leak center and from varying leak rates. Dec02|03 data was from a 20 standard liters per minute (slpm) controlled leak, Nov01|04 data are from a 5 slpm controlled leak, and the remaining files are from a 10 slpm controlled leak.
• Measurements were taken downwind relative to a 0.9 metres (leak depth) below-ground gas leak at a test bed with a grass surface cover.